Effect of Precipitation on the Microhardness Distribution of Diode Laser Epitaxially Deposited IN718 Alloy Coating  

作　　者：Yaocheng Zhang Zhuguo Li Pulin Nie Yixiong Wu 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Materials Science and Engineering,Shanghai Jiao Tong University [2]State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University

出　　处：《Journal of Materials Science & Technology》2013年第4期349-352,共4页材料科学技术（英文版）

基　　金：financially supported by the Ministry of Science and Technology of China(No.2009DFB50350);the National Natural Science Foundation of China(No.50971091)

摘　　要：The microhardness distribution of the diode laser epitaxially deposited IN718 alloy coating was investigated. The Laves concentration in different regions of the coating was measured by binarization processing. The strengthening phase of the coating was characterized by transmission electron microscopy （TEM）. The results showed that the microhardness increased along the depth of the coating. Part of Laves dissolved into austenitic matrix during the successive laser deposition, A little amount of strengthening phase was precipitated in the bottom region of the coating. It was attributed to the heat effect from the thermal cycle of successive deposition on the microstructure in the bottom region of the epitaxially deposited coating.The microhardness distribution of the diode laser epitaxially deposited IN718 alloy coating was investigated. The Laves concentration in different regions of the coating was measured by binarization processing. The strengthening phase of the coating was characterized by transmission electron microscopy （TEM）. The results showed that the microhardness increased along the depth of the coating. Part of Laves dissolved into austenitic matrix during the successive laser deposition, A little amount of strengthening phase was precipitated in the bottom region of the coating. It was attributed to the heat effect from the thermal cycle of successive deposition on the microstructure in the bottom region of the epitaxially deposited coating.

关 键 词：IN718 alloy Laser epitaxial deposition Microhardness distribution PRECIPITATION 

分 类 号：TG174.44[金属学及工艺—金属表面处理]